An integer which is expressible in more than one way in the form 
or 
where 
is relatively prime
to 
. If the integer
is expressible in only one way, it is called a monomorph.
Polymorph
See also
Antimorph, Demiregular Tessellation, Idoneal Number, Monomorph, Pell EquationExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Polymorph." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Polymorph.html